Escalation Trap, Sunk Cost
The Dollar Auction
The Dollar Auction is an Escalation Trap and Sunk Cost scenario. The core lesson: Rational people can be trapped into irrational escalation by the structure of the game itself. A $20 bill is being auctioned. Highest bid wins it. DecisionPlay maps the players, payoffs, and equilibrium dynamics that shape how this situation typically resolves.
The situation
A $20 bill is being auctioned. Highest bid wins it. The twist: the second-highest bidder also pays their bid but gets nothing. Bidding starts at $1. Do you bid?
Background
The dollar auction was invented by economist Martin Shubik in 1971 and has been replicated in classrooms and labs ever since. The auction routinely produces bids exceeding $20 for a $20 bill. Once two people are bidding, the second-highest bidder faces a choice: bid higher (and maybe win) or stop (and definitely lose their current bid). At every step, bidding one more dollar feels rational. The result: both bidders end up paying more than the prize is worth. This is the structure of arms races, bidding wars, and any conflict where 'one more round' always seems cheaper than quitting.
What this reveals
The escalation trap
Rational people can be driven to irrational outcomes by game structures that make quitting feel more expensive than continuing at every single step. The trap works because each individual decision to continue is locally rational while the sequence is globally disastrous. Arms races, bidding wars, lawsuits, and prolonged conflicts all share this structure.
How to counter it: Before entering any competitive situation, set your walk-away point in writing. If the competition structure means the second-place finisher also pays, think very carefully before entering at all.
A question to sit with
Where in your life are you currently 'one more round'-ing a competition you should have exited three rounds ago? What would it cost to stop right now?
Frequently asked questions
- What game theory concept does The Dollar Auction illustrate?
- The Dollar Auction illustrates Escalation Trap, Sunk Cost. Rational people can be trapped into irrational escalation by the structure of the game itself.
- What is the situation in The Dollar Auction?
- A $20 bill is being auctioned. Highest bid wins it. The twist: the second-highest bidder also pays their bid but gets nothing.
- What does The Dollar Auction reveal about how people decide?
- The escalation trap. Rational people can be driven to irrational outcomes by game structures that make quitting feel more expensive than continuing at every single step. The trap works because each individual decision to continue is locally rational while the sequence is globally disastrous. Arms races, bidding wars, lawsuits, and prolonged conflicts all share this structure.
- How do you avoid the trap in The Dollar Auction?
- Before entering any competitive situation, set your walk-away point in writing. If the competition structure means the second-place finisher also pays, think very carefully before entering at all.
- What is the research behind The Dollar Auction?
- The dollar auction was invented by economist Martin Shubik in 1971 and has been replicated in classrooms and labs ever since. The auction routinely produces bids exceeding $20 for a $20 bill. Once two people are bidding, the second-highest bidder faces a choice: bid higher (and maybe win) or stop (and definitely lose their current bid).
- How long does The Dollar Auction take to play?
- About 8 min, at core difficulty, across 4 decision points. It runs in your browser with no account and no sign-in.
Keep exploring
More Classical Game Theory scenarios, or browse all scenarios. New to this? Start with how DecisionPlay works or the game theory glossary.
Topics: escalation, sunk-cost, auction, commitment